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#171
08-24-2008, 09:47 PM
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Quote:
Yeah, I don't have Rocksim but I suspected that a cluster of 3xA10-3T's might have some high DV values on a lot of designs. I'm thinking about making a 3x13mm interchangeable mount for my New Centurion; after all, that's about 3/4 of a C engine, so a big heavy rocket like the NC shouldn't be going too fast when the ejection charges fire. I'm also considering a 2x13mm X-24 Bug... two A10-3T's ought to work in that sort of rocket. I've already made a 74% downscale entirely from paper which I plan to fly on a single A10-3T. Soon, hopefully.
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NAR # 115523 Once upon a better day... SAM #0076 My site: http://rocketry.gonnerman.org 
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#172
08-24-2008, 09:56 PM
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Magic Number Update
21...
I just noticed my "Lil' Battle Axe" design was missing from the Master List! 
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 08-24-2008 at 10:14 PM. Reason: Another one caught between the cracks...
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#173
08-24-2008, 09:59 PM
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Quote:
My Falconaire design uses two 13mm motors... Lots of work, though. 
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635
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#174
08-24-2008, 10:00 PM
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Jay weighs in again...
Quote:
This design wins my award for "Most Unusual Use of a BC-760!" You and James have come up with plenty of eye-catching designs with that cone, so my thanks and congratulations to you both. Me, all I could manage was "Tau Zero" and "Zeta."   Cheers,
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Jay Goemmer "Centuri Guy"/"Tau Zero" YORF Member 28 Semroc SAM #0029 NAR 86131 "I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri.  "--Bill Eichelberger, 02/22/2022 “Centuri fret buzz in an updated form.” Bill “Wallyum” Eichelberger re: Estes Flutter-By 03 Sept 2014
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#175
08-24-2008, 10:05 PM
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Quote:
Looks good, JP. ST-13 sized, and still gets 300+ altitude... Now, wrangle up an ST-18 design, something simple will do, using a single 13mm, capable of ~125' with a low Dv. Streamer recovery is acceptable. The idea is to create a rocket that can be flown in almost any small yard, but still be larger than the typical stuff Estes puts out for 13mm. Like a Lionel train in young hands...
__________________
Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635
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#176
08-24-2008, 10:10 PM
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Quote:
Thanks, Jay. It's actually the second design where I've used the 760 in this way, but I can't remember the name of the other one right off hand... Addendum: Found it! It was the Non Aspera. Used a clear CPT-7 tube for dramatic effect...
__________________
Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 08-24-2008 at 11:08 PM.
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#177
08-24-2008, 11:35 PM
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New ST-18 Design -- Brutus
Quote:
 So much for 27 fps qualifying as "low Dv" (probably not, but I gave it my best shot).  I started out with a 9" long tube and a BC-1828, and kept adding nose weight (even an SE-14 and some WL-7 nose weights during the process), but that didn't really help things. This basically ended up looking like a slightly more brutal Big Bertha variant, so I called him "Brutus." .
__________________
Jay Goemmer "Centuri Guy"/"Tau Zero" YORF Member 28 Semroc SAM #0029 NAR 86131 "I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "--Bill Eichelberger, 02/22/2022 “Centuri fret buzz in an updated form.” Bill “Wallyum” Eichelberger re: Estes Flutter-By 03 Sept 2014
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#178
08-25-2008, 02:02 AM
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Quote:
Notice the 'optimal delay' time? 2.09 seconds. On a 3-second delay, it is falling for half as much time as it is coasting upward. That's why the Dv is high. Good shot, Jay. You (nearly) met all of the parameters of the challenge. I'll include it in the list, but we need to tweak it a bit to get that Dv down below 20. Even a streamer becomes a screamer at some point... Addendum: I think I'll just build one and see what screams - the model, or me... Magic Number is now 20...
__________________
Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 08-25-2008 at 01:33 PM.
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#179
08-25-2008, 11:01 PM
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Hmm. As I said, I don't have Rocksim, but I do have a hunch.
Start with an Estes Patriot; remove all the body tubes and couplers, swapping in a Baby Bertha style 7.5" long BT-60 tube. Install a 13mm engine mount, and see what the DV is with an A10-3T. I have a hunch it will be low. Admittedly, my hunch is based on notes I took when I played with the Baby Bertha and Patriot parts last year while still trying out Rocksim. But I never tried it with a 13mm mount and A10-3T, so I'm just guessing... Every time I have a hundred bucks to spend on rocketry, I think "Rocksim or a big bunch of parts?" and the big box of parts wins every time.
__________________
NAR # 115523 Once upon a better day... SAM #0076 My site: http://rocketry.gonnerman.org
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#180
08-26-2008, 10:10 PM
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New Design -- Guerrero
I've had the name "Guerrero" (which is Spanish for "Warrior") as a possible name for a rocket for several years now, but hadn't come up with a design that the name really fit.
Until now. I was watching the 4th season of "Babylon 5" last night, and noticed some cool ships based on the number 5. (See picture #1 below.) I was able to identify them as "Drakh raiders." One thing led to another (1982 "Fixx" reference), and tonight I bring you my sick and twisted B5-inspired model rocket adaption entitled... "Guerrero." (And yes, I'll have to piece the fins together... Maybe from 1/16" balsa with the grain running in appropriate directions, and then a second layer oriented "crossways," topped off with computer label paper on the outside.) Have fun, kids! .
__________________
Jay Goemmer "Centuri Guy"/"Tau Zero" YORF Member 28 Semroc SAM #0029 NAR 86131 "I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "--Bill Eichelberger, 02/22/2022 “Centuri fret buzz in an updated form.” Bill “Wallyum” Eichelberger re: Estes Flutter-By 03 Sept 2014
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